Gryffindor, I hope. I value courage beyond almost anything. But I’d be quite a good fit in Ravenclaw, too.

I used to think it would be an otter, which I gave to Hermione in the books, because I love otters so much, but I’ve got a feeling that if I ever managed to produce one, it would be some kind of large bird. Possibly an owl.

They’re mostly made up, though some derive from old charms people thought genuinely worked, such as Avada Kedavra, from which came ‘abracadabra’. I used a good bit of pig Latin and took liberties with archaic words, too.

If they’re Muggle-born, they’ll go to regular schools. Wizarding families tend to home school their children until they’re ready for Hogwarts.

I think it would have to be Dumbledore. We’d have a lot to discuss and I would love his advice; I think that everyone would like a Dumbledore in their lives.

Poor Hedwig died in book seven, but I like to think Harry would always have a snowy owl in her honour. Crookshanks lived to a ripe old age, but I’m afraid he’s no longer with us.

Harry Potter and the Cursed Child was conceived and written as a stage play. It was always intended to be a stage play and nothing else, and I’m afraid there are absolutely no plans for it to become a movie, a novel, a puppet show, a cartoon, a comic book series or Cursed Child on Ice!

I have always refused to say ‘never’ to this question, because I think it would be foolish to rule out something I might want to do in the future. The play Harry Potter and the Cursed Child is a prime example. I was intrigued to do something new. Working with Jack Thorne (the playwright) and John Tiffany (the director) was one of the most satisfyingly creative experiences of my working life. We developed the story together and I couldn’t be more thrilled with the result.

I think Dudley’s out there living a happier and better life for having known Harry. He wouldn’t be nearly as hidebound and fiercely conventional as his parents. Neville became a Herbology teacher at Hogwarts, where I think he’d be hugely popular.

Luna married a descendant of Newt Scamander and became a magizoologist.